The invention discloses a marine drill pipe connector. The marine drill pipe connector comprises a male connector and a female connector, the male connector and the female connector are provided an outer thread and an inner thread which are mutually matched, conical shoulders are arranged at the end, away from the outer thread end, of the male connector and the end, away from the inner thread end,of the female connector, the conical shoulders are provided with a plurality of helical structural reinforcing ribs at intervals, and a spiral groove is formed between the every two adjacent reinforcing ribs. According to the marine drill pipe connector, the conical shoulders are provided with the multiple helical structural reinforcing ribs and spiral grooves at intervals, so that the marine drill pipe connector is high in torsional strength, large in load and uniform in stress distribution, and satisfies the high torsion demand of drilling an extradeep well by a marine drill pipe. The reinforced ribs and the spiral grooves further have the disadvantages of speeding up drilling fluid circulation and improving resistance to erosion and abrasion and other disadvantages, untimely abrasion and failure of the marine drill pipe can be prevented, the life of the drill pipe is prolonged, the well drilling efficiency improved, the well drilling period is shortened, and the well drilling costis reduced.